This is my first time ever trying to make my own computer and i plan to overclock and buy a second gtx 670 eventually.
I plan to sub out the CPU cooler for the thermaltec hc-02 macho and im willing to change from ASUS, it just ended up like that
I went with the 850w because it was actually cheaper on pcpartpicker then its 750 brother
is seagate better then western?
If you want more options and don't mind a sound card taking up a pci slot, you could keep the sound card. Though for most people the integrated sound (Realtek ALC892) on your motherboard is good enough.
edit: the seagate hdd he suggested is cheaper - will save you money, though IICR the warranty isn't as good as WD's.